I am retired now, but it seems that these rubric-based evaluation systems seem to empower and bring out the worst in many administrators. Disrespectful and insensitive to whom? It seems to me that he is being disrespectful and insensitive to you by using such strong language that could be interpreted (or misinterpreted) widely.

I am sorry that you are working for such a person. I think, if I remember correctly, you got a transfer to a different school where you also had someone who didn't appreciate you and your hard work.

I retired two years ago, and I have to say that while the main factor was financially-based, my administrator was not someone who valued me or even knew me as a person. I felt marginalized by her, and every observation was a picky one where she never failed to mention storage of materials no matter what I did or how similar my room looked to others.